Bearing hone



Sept. 20, 1955 F. A. WAGNER BEARING HONE Filed Dec. 20, 1952 INVENTOR.

FREDER/C/(A .WAGNER BY ATTORNEY United States Patent BEARING HONE Frederick A. Wagner, Livermore, Calif.

Application December 20, 1952, Serial No. 327,076

2 Claims. (Cl. 51-184.3)

This invention relates to devices for lightly grinding or honing machine bearings to accurately finish their bores, and particularly to regrind and hone connecting rod bearings which have become worn or out of round.

The principal object of the invention is to provide a simple, easily used device for quickly accomplishing the work above noted.

Briefly stated my improved bearing hone comprises an expansible multi bladed mandrel provided with a wrapping strip or band of emery cloth (or the like) which may be moved slightly at intervals while in grinding position to bring a plurality of fresh emery cutting surfaces into use.

In the drawings Fig. 1 is a side view of the device or tool with the emery cloth omitted to better show the construction.

Fig. 2 is an enlarged cross section of the tool taken along the line 2 -2 of Fig. 1.

Fig. 3 is a cross section of Fig. 1 taken along the line 33 thereof.

Fig. 4 is an enlarged central longitudinal cross section of the tool of Fig. 1.

Fig. 5 is a plan view of one of the two stay rods or spacers.

Fig. 6 is a plan view of the emery cloth reeling spindle.

Fig. 7 is a cross section of Fig. 6 taken along the line 77 thereof.

Fig. 8 is a cross section of Fig. 6 taken along the line 8-8.

In further detail the drawings show a tool comprising two cylindrical body portions 1, 2, rigidly spaced apart as by a pair of shouldered spacing or stay rods 3 either tightly pressed into place and/or pinned to the body portions. In the space between the body portions 1 and 2 are several (four preferred) flat blades or plates 4 arranged radially slidable in grooves 5 formed in the confronting ends of the body portions embracing opposite marginal ends of the plates.

The plates are preferably of hardened steel and are disposed diametrically opposite one another so that each in its grinding action will be directly supported by an opposite plate to insure rotundity of the ground bearing.

Adjacent opposite ends the plates are formed with V- shaped openings or cut-outs 6 to receive V-shaped expander lugs or wedges 7 carried on a centrally disposed rod 8 which may be slid axially by means of an exteriorly operated handle 9 to uniformly expand the plates. A circular coil spring 10 engaged over hooks 11 are formed at one end of a central gap or cut-out 12 in the plates serves to retract the expanded plates when the rod 8 is moved to the right in Fig. 4. The opposite ends of rod 8 are preferably axially guided in bores in the body portions by hubs 13, 13' and moved along by a threaded rod 14 secured at its outer end to the handle 9 and screwed through a threaded bushing 15 held in place by a set screw 16. A set screw 17 in the opposite body portion 2 provides for securing the tool to a driving shaft 18.

Patented Sept. 20, 1955 The particular feature or improvement on which novelty is predicated is the provision of an adjustable emery cloth strip passing over the outer edges of the expanding plates 4. This strip is indicated at 19 and one end of it passes through a slot 20 in a winding reel or spindle 21 which is mounted between two of the plates 4 with its ends rotatably supported in the body portions 1 and 2 and provided with a wrench rod winding socket 22 exposed for accessibility at the outer end of body portion 1. This socket 22 has a shank 23 which extends into a tubular sleeve 24 and is secured thereto as by a cross pin 25. The sleeve is slotted along one side only as indicated at 26 and the slot enlarged to receive the end of a short pin 27 projecting from the spindle 21. This construction results in an irreversible reel or one which is automatically locked or braked against unreeling the emery cloth from any pull on the cloth, while permitting free winding up or unwinding by means of a hand wrench applied to the socket 22. The reason being that the turning of the socket turns the sleeve 24 as a whole and revolves the spindle 21, whereas any attempt to turn the spindle as by pulling on the emery cloth strip spreads the split shank of the sleeve 24 through pressure against one side of the slot only and tends to spread the split and locks the sleeve in its bearing bore, it being understood that the fit of the sleeve in its bore is very snug to begin with.

Since the emery strip becomes worn only where it passes over the edges of the plates it may be advanced a trifle many times to secure fresh cutting surfaces, and since the plates are rigid and set diametrically opposite one another the opposite cutting edges are rigidly supported in the grinding and honing operation, and no chattering takes place, but the finished bearing bores are as accurate as the best solid wheel grinding and honing can produce.

Having thus described my improved bearing hone What I claim is:

1. In an expansible mandrel of the character described having radially extending and radially adjustable rigid plates spaced about its circumference, the improvement which comprises a flexible band receiving reel extending longitudinally within said mandrel in the space between two of and within the outer edges of said plates when contracted, means for mounting said mandrel at one end for rotation, manually operated means at the outer end of the mandrel for simultaneously radially adjusting said rigid plates and means accessible at the same end for turning the reel, and means for automatically locking the reel against unturning, the arrangement of said reel relative to the mandrel being such that a strip of emery cloth wound from one end upon the reel may be extended therefrom over the outer edges of all of the rigid mandrel plates and the other end left extended free within the reel space.

2. In a structure as set out in claim 1, the means for locking the reel against unturning comprising a shaft extension from the reel fitted with a clutch operative to prevent such turning of the reel from within the mandrel, and means for turning said clutch bodily with said reel operative from the outer end of the mandrel only.

References Cited in the file of this patent UNITED STATES PATENTS 564,587 Black July 28, 1896 864,923 Saunders Sept. 3, 1907 1,775,230 Wacker Sept. 9, 1930 2,465,225 Haren Mar. 22, 1949 2,543,193 Palotsee Feb. 27, 1951 2,618,914 Rose Nov. 25, 1952 2,624,217 Clark Jan. 6, 1953 

